Halfway Hill Quarry (Paleocene to of the United States)

Also known as Under the Maelstrom; UW V-94041

Where: Carbon County, Wyoming (41.8° N, 107.0° W: paleocoordinates 47.6° N, 86.8° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: lower Member (Hanna Formation), Torrejonian to Torrejonian (63.3 - 56.8 Ma)

• said to be late Torrejonian to early Tiffanian

Environment/lithology: terrestrial

Primary reference: R. Secord. 1998. Paleocene mammalian biostratigraphy of the Carbon Basin, southeastern Wyoming, and age constraints on local phases of tectonism. Rocky Mountain Geology 33(1):119-154 [J. Alroy/J. Alroy/J. Marcot]more details

PaleoDB collection 14851: authorized by John Alroy, entered by John Alroy on 21.09.1998

Creative Commons license: CC BY (attribution)

Taxonomic list

• probably includes material from UW V-94048
Mammalia
 Cimolesta - Cimolestidae
Paleotomus carbonensis n. sp. Secord 1998 eutherian
Gelastops cf. joni Rigby 1980 eutherian
 Primates -
Palaechthon cf. alticuspis Gidley 1923 primate
 Primates - Plesiadapidae
Plesiadapidae indet. Trouessart 1897 primate
 Primates - Palaechthonidae
Plesiolestes sp. Jepsen 1930 primate
 Condylarthra - Hyopsodontidae
"Promioclaenus cf. lemuroides" = Ellipsodon lemuroides Matthew 1897 condylarth
Promioclaenus acolytus Cope 1882 condylarth
cf. Protoselene sp. Matthew 1897 condylarth
 Macroscelidea - Apheliscidae
Haplaletes disceptatrix Simpson 1935 elephant shrew
 Tribosphenida - Arctocyonidae
cf. Mimotricentes sp. Simpson 1937 condylarth
Thryptacodon sp. Matthew and Granger 1915 condylarth
"Mimotricentes ? subtrigonus" = Tricentes subtrigonus Cope 1881 condylarth
 Multituberculata - Neoplagiaulacidae
Parectypodus sylviae Rigby 1980 multituberculate
Neoplagiaulax nelsoni Sloan 1987 multituberculate
 Multituberculata - Ptilodontidae
Ptilodus sp. Cope 1881 multituberculate
"C"
Ptilodus mediaevus Cope 1881 multituberculate
 Multituberculata - Cimolodontidae
Anconodon sp. Jepsen 1940 multituberculate